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Chủ đề:

Bài 24: Luyện tập hợp chất hữu cơ, công thức phân tử và công thức cấu tạo

Câu hỏi:

Giúp mình với ạ!!!

Bài 1 : A gồm C , H , O , N Có 1 lệ khối lượng tương ứng là 3:1:4 :7 và có khối lượng phân tử nhỏ hơn khối lượng phân tử của benzen . . Tìm công thức phân tử của A , biết A là loại phân đạm , cho biết công thức cấu tạo của A .

Bài 2 : khi đốt cháy 1 lít hiđrocacbon cần 6 lít O2 và sinh ra 4 lít CO2 xác định công thức phân tử hiđrocacbon .biết các khí đo cùng điều kiện

Bài 3 : Đốt cháy hoàn toàn một lượng chất hữu cơ chứa C ,H, cl sinh ra 0,22 gam CO2 và 0,09 gam H2O khi xác định lượng Clo có trong hợp chất bằng AgNO3 thu được 1,435 gam Agcl tìm công thức phân tử chất hữu cơ biết tỉ khối hơi so với Hidro bằng 42,50.

Bài 4 : Đốt cháy hoàn toàn 0,452 gam hợp chất A sinh ra 0,331 gam CO2 và 0,2714 gam H2O đun nóng 0,3682 gam chất A với vôi tôi xút để biến tất cả Nitơ trong A thành Amoniac rồi dẫn NH3 vào 20 ml dung dịch H2SO4 0,5 M để trung hòa axit dư sau khi tác dụng với NO3 cần dùng 7,7 ml NaOH 1M

1 .tính phần trăm khối lượng các nguyên tố trong A

2 .tìm công thức phân tử biết Ma = 60

Bài 5: cho 400 ml một hỗn hợp gồm nitơ và một chất hữu cơ ở thể khí chứa cácbon và Hidro vào 900 ml oxi dư rồi đốt thể tích hỗn hợp sau khi đốt là 1,4 lít sau khi cho Nước ngưng tụ thì còn 800 ml hỗn hợp người ta cho lội qua dung dịch KOH thấy cần 400 ml khí xác định công thức phân tử chất hữu cơ (các khí đo ở cùng điều kiện)

Chủ đề:

Luyện tập tổng hợp

Câu hỏi:

4 giờ trước (16:43)

Giúp mình trả lời với!!!

Sử dụng relative clause ạ

1. Here are the letters. They amved this

2. He was sitting in the cmergency room. It was very crowded

3 Thats the house. I was born in it

4. That's the dictionary Bill gave it to me for Christmas.

5. The children went to New York. They speak English.

6. I met Arthur Jones His book on sports sells very well

7. Steve and Lynn are Americans. They own the little restaurant on Bndge Street

8. Their story sounds incrediblc. It is true

9. Those are the ears. They only take unleaded petrol.

10. Do you like the people? Sarah invited then to her party

II. The man was sick He looked very pale.

12. The doctor asked him to lie down. She looked very womed

13. Who was that man? I saw you with that man in the restaurant. (pre pronoun)

14. The wall is dirty You are leaning against it. (pre pronoun)

I5. Dr. Rowan has had to do all his own typing His secretary resigned two weeks ago

16. Harry is an engineer. His wife has just given birth to twins

17. This is my friend I was spcaking of him

18. Tom bad been driving all day. He was tired and wanted to stop

19. We praised John. His performance was remarkable.

20. I'm going to visit Brazil. I don't know anything at all about it (pre pronoun)

21. My uncle Tom will be arriving tomorrow. You've heard so much about him. (prespronoun)

22. history of the town will be published soon Pcople know nothing about it (pre pronoun)

23. The architect designed these flats. He has moved to HCM City

24. Do you know the music? It is being played on the radio.

25. One of the elephants had only one tusk. We saw these clephants at the zoo

Chủ đề:

Luyện tập tổng hợp

Câu hỏi:

V . Choose the word or phrase B , C or D that best completes the sentence .

21 . The problem _ never occurred .

B , that I had expected it

A . I hadn ' t expected it

D . I had expected -

C . who I had expected

22 . In 1850 , Yale University established Sheffield Scientific School ,

A . engineers were educated there |

B where engineers were educated .

C . in which engineer educated

D . where were engineers educated

23 . It was the ragtime pianist Scott Joplin the Maple Leaf Rag , perhắps the best know of all agame tunes . |

A Wrote

B , the writer of

C . who wrote

D . writing

24 . A keystone Species is a species of plants and animals ___absence has a major effect on an ecological system .

A . that its |

B , its

C . whose |

D . with its

25 . William Samuel Johnson , ____helped write the Constitution , became the first president of Columbia College in 1187

A. Whom he had

B . who had

C . and he had

D . had

26.My mother,____ , enjoys hill walking .

A. Whom is in hẻ seventies

B , that is in her seventies

C. Which í in hẻ seventies

D . who is in her Seventies

27 . She ' s one of the kindst people _ I ' ve ever known .

A . that

B . whose_

C . who

D . which

28 . Where is the house____

A where they are living

C . where they are living there

B . which they are living

Dwhere they are living in

.29 She lives in the house ,____

. A which has the red door

C . that with the red door

B . has the red door

D . with its red door

30 . Mark Twain is an author ___I like best

A . his books

B , that books |

C . the book of whom

D . whose books

Chủ đề:

Luyện tập tổng hợp

Câu hỏi:

Giúp mình trả lời với!!!

Sử dụng relative clause ạ

1. Here are the letters. They amved this

2. He was sitting in the cmergency room. It was very crowded 3 Thats the house. I was born in it 4. That's the dictionary Bill gave it to me for Christmas. 5. The children went to New York. They speak English. 6. I met Arthur Jones His book on sports sells very well 7. Steve and Lynn are Americans. They own the little restaurant on Bndge Street 8. Their story sounds incrediblc. It is true 9. Those are the ears. They only take unleaded petrol. 10. Do you like the people? Sarah invited then to her party II. The man was sick He looked very pale. 12. The doctor asked him to lie down. She looked very womed 13. Who was that man? I saw you with that man in the restaurant. (pre pronoun) 14. The wall is dirty You are leaning against it. (pre pronoun) I5. Dr. Rowan has had to do all his own typing His secretary resigned two weeks ago 16. Harry is an engineer. His wife has just given birth to twins 17. This is my friend I was spcaking of him 18. Tom bad been driving all day. He was tired and wanted to stop 19. We praised John. His performance was remarkable. 20. I'm going to visit Brazil. I don't know anything at all about it (pre pronoun) 21. My uncle Tom will be arriving tomorrow. You've heard so much about him. (prespronoun) 22. history of the town will be published soon Pcople know nothing about it (pre pronoun) 23. The architect designed these flats. He has moved to HCM City 24. Do you know the music? It is being played on the radio. 25. One of the elephants had only one tusk. We saw these clephants at the zoo